Tourmaline

Hardness ( Moh )

" 7 - 7.5

Crystal System

Trigonal

Specific Gravity

3.02 - 3.26

Refractive Index

1.620 and 1.640 (usually)

Birefringence

Family

Colour(s)

White, Colorless, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple, Gray, Black, Multicolored

Cleavage

Francture Type

Uneven, small conchoida

Luster

Streak

White

Transparency

translucent to opaque

Formula

(Ca,K,Na,[])(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6 (BO3)3(Si,Al,B)6O18(OH,F)4

Country

Found In Argentina,Australia,Austria,Bolivia,Brazil,Canada,Czech Republic,DR Congo,France,Germany,Italy,Japan,Kazakhstan,Kenya,Madagascar,Mexico,Myanmar,Namibia,New Zealand,Norway,Portugal,Russia,Slovakia,Slovenia,Spain,Sri Lanka,USA